Journal
PHYSICAL MESOMECHANICS
Volume 20, Issue 2, Pages 149-156Publisher
SPRINGER
DOI: 10.1134/S1029959917020059
Keywords
mixed mode I/II; PMMA; SED criterion; fracture toughness; semicircular and triangular specimens
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In this work, some recent mixed mode I/II fracture toughness results obtained from Perspex (or polymethylmethacrylate (PMMA)) with four simple cracked specimens subjected to the conventional three-point bend loading are reanalysed based on local energy concept. Although all the mentioned samples have been tested under the same and similar mode mixities, different fracture toughness envelopes were obtained for mixed mode I/II fracture of PMMA. The averaged strain energy density (SED) criterion has been applied in the past for different types of notched specimens (including U, V, O and keyhole notches). It is shown that the mixed mode tensile in plane shear fracture toughness data obtained from the semicircular and triangular crack type specimens are successfully predicted for sharp cracked PMMA samples using the SED criterion.
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